Value for muon-electron mass ratio
type: ConstantValue
has unit: UNITLESS
informative reference: http://physics.nist.gov/cuu/Constants/bibliography.html
standard uncertainty: 0.0000052
standard uncertainty SN: 5.2E-6
value: 206.7682823
value SN: 2.067682823E2
website: http://physics.nist.gov/cgi-bin/cuu/Value#mid